`svelte-package` warn about circular dependencies

Describe the problem

svelte-package has a bunch of very useful built-in health checks like

@sveltejs/package found the following issues while packaging your library:
You have a svelte field in your package.json, but no root export in your exports. Please align them so that bundlers will resolve consistently to the same file.

Would be great if it could also check for circular dependencies within the /lib folder.

Describe the proposed solution

With this setup, svelte-package should warn about circular dependency between Component and index.

// src/lib/index.ts
export { default as Component, default } from './Component.svelte'

const variable = 42

<script>
  // src/lib/Component.svelte
  import { variable } from './'
</script>

{variable}

Alternatives considered

No response

Importance

would make my life easier

Additional Information

This would prevent problems like https://github.com/janosh/svelte-multiselect/issues/228 causing packages to break in the REPL and triggering NPM warnings.

Start by locating the existing health checks used by svelte-package, then review the example files src/lib/index.ts and src/lib/Component.svelte to understand the reported cycle. Done means packaging this setup emits a circular-dependency warning for the /lib folder, with coverage for the example case.